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The mean drying time of a brand of spray paint is known to be 90seconds. the research division of the company that produces this paint contemplates that adding a new chemical ingrediant to the pain will accelarate the drying process. To investigate this conjecture, the pain with the chemical additive is sorayed on 15 surfaces and the drying times are recoreded. The mean and standard deviation computed from these measurements are 86 and 4.5 seconds, respectively. assume the measurements consitutes a random sample from a normal population. Do these data provide strong evidence that the mean is drying time is reduced by the addition of the new chemical? to answer this question, perfeom the hypothesis testing ( at the significance level ?=.01) by answering the questions below.
(a) Define the mean in the context of the problem
(b) Formulate the null and alternative hypothesis
(c) State the Type 1 and type 2 error in the context of the probelm
(d) State the test statistic and its disturbution
(e) Determine the critical value for ?=.01 and state the decision rule.
(f) State weather Ho is rejected and tell why.
(h) State your conclusion in words
Probability that if 11 households are selected at random, exactly 9 of the households will own DVD players? Calculate the mean and standard deviation for the problem.
assume you are in charge of a production line which allows for no more than 1 defectives in order to be in compliance.
Of 970 subjects, 20 answered yes and 950 answered no. find p^, the proportion of the sample who were victims. Find the standard error of this estimate.
Find the probability distribution for X defined as the number of defective items drawn (Hint: You have to find P(X=0), P(X=1) and P(X=2). You may have to use both multiplicative and additive rules to find P (X=1)).
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
assume a normal distribution. draw a well-labeled curve for each part. round both to two decimal places.a. find
determine if the following data set is a population or a sample the average electric bill for the 50 united states and
the sugar content of the syrup in canned peaches is normally distributed. a random sample of n 10 cans yields a sample
Conduct an ANOVA comparing the anxiety levels (at posttest only) of participants across all three treatment conditions: CBT, psychodynamic, and supportive therapy.
Each,day Monday through Saturday, a baker bakes three large chocolate cakes and those not sold on the same day are given away to a food bank.
find the mean variance and standard deviation for the following probability distributionxnbsp nbsppx0nbspnbsp
If the gender-selection method has no effect and boys and girls are equally likely, find the mean number of boys born in groups of 152. Round to the nearest whole number.
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